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A Practical Approach, Second Edition=Ronald D. Ho.pdf

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CHAPTER 9Significance, Reliability, and Interpretationof Developmental andReproductive Toxicity Study FindingsJoseph F. <strong>Ho</strong>lson, Mark D. Nemec, Donald G. Stump, Lewis E. Kaufman,Pia Lindström, and Bennett J. VarshoCONTENTSI. Introduction ........................................................................................................................330A. Basis of Chapter ........................................................................................................330B. Overview of Chapter .................................................................................................331II. Significance of Developmental and Reproductive Toxicology .........................................333A. Historical Background on Predictive Power of Animal Studieswith Regard to Human Developmental and Reproductive Outcomes......................333B. Animal-to-Human Concordance for Reproductive Toxicity.....................................337III. Study Design Considerations.............................................................................................342A. History of Study Design............................................................................................3441. Pharmaceuticals ...................................................................................................3442. Agricultural and Industrial Chemicals ................................................................347B. Species .......................................................................................................................348C. Characterization of Dose-Response Curve ...............................................................350D. Dose Selection and Maximum Tolerated Dose.........................................................352E. General Statistical Considerations.............................................................................3531. Statistical Power ..................................................................................................3532. The Litter Effect ..................................................................................................353IV. Dose Range–Characterization Studies vs. Screening Studies...........................................354A. Dose Range–Characterization Studies ......................................................................354B. Developmental and Reproductive Toxicity Screening Studies.................................358C. Converging Designs...................................................................................................361V. Developmental Toxicity Studies ........................................................................................361A. Guideline Requirements ............................................................................................3621. Animal Models ....................................................................................................3622. Timing and Duration of Treatment .....................................................................362B. Interpretation of Developmental Toxicity Study Endpoints .....................................3641. Maternal Toxicity and Its Interrelationship with Developmental Toxicity ........365329© 2006 by Taylor & Francis Group, LLC

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